Knife-sharpening machine.



J.- MfiLLBR.

KNIFE SHARPENING MACHINE. APPLICATION FILED AUG. 12, 1907.

911,744. PatentedFeb,9,1909.

Wi/T/YwSSBS f Jnvenio r .TOSEF MULLER, F BARMEN, GERMANY.

KNIFE-'SHARPENING MACHINE.

Specification of Letters Patent.

Patented Feb. 9, 1909.

Application filed August 12, 1907, Serial No. 388,214.

To all whom it, may concern: Be it known that I, JosEF MULLER, residing in the city of Barmen, Empire of Germany, Rhenish Prussia, a subject of the Emperor of Germany, have invented new and useful Improvements in Knife-Sharpening Machines, of which the following is a specifi cation. I

My invention relates to knife sharpening machines and it has forits object a device, which is rovided with two or more grindstone roll s for treating the knife said rolls having a combined rotating and reciprocating movement so that :the knife lying unmovable in the machine'is sharpened on the whole length of itsblade. I

On the accompanying drawing Figure 1 is a to view of the machine, Fig. 2 a vertical section taken, along line II of Fig. '1. The machine consists of two standards a which are connected by the bars h and are provided with screws i for fastening it to a table. In said standards are turnably located the shafts b and on said shafts are seated the two grindstones or'rolls (Z that are turnably secured on said shafts" but at the same time may be shifted thereon. The grindstones d are surrounded by a box 0 which receives the grinding matter of pulverized or liquid form as desired.

By 9 is marked a spindle or shaft j ournaled in the frames a. whlch has a left and right screw thread and is in connection with the box 0 by means of a secured to said boX. By turning the shaft 9 nut which is pivotally 7 by means of the crank u the same will cause the box 0 with the rollers dto reci rooate.

I The rotation of the same is eflecte in the following way: On the spindle g is seated a gear is which meshes with a gear m, being in connection with a gear 12 and the latter drives by means, of a toothed wheel 0 the gear 7. The wheels 1" and m are keyed to the shafts b and by this gearing the rolls d are caused to revolve and sharpen the knife blade being held between them on different arts of its, length. For regulation of the rol ers (Z the set screws 7' are provided.

I do not limit myself to the device shown for traveling the rollers cl to and fro, this may be changed by any other suitable means.

What I claim is:

v In a knife sharpening machine the combination of two standards, two shafts carried therein, a gear to revolve said shafts in contrary direction, two grindstones seated on said shafts one of which having a lateral adjusting motion, a casin surrounding said grindstones, a left and right threaded revolving shaft located in said frames said shaft having connection with the casing as described and for the purpose set forth.

In testimony whereof I have signed my name in the presence of two subscribing witnesses.

' JOSEF MULLER. [L.' s.]

Witnesses Orro KoNre, HEINRICH ONGETS. 

